| Mareczek vs King | 11–17 | 39.29% |
| Mareczek vs Kazuya | 11–12 | 47.83% |
| Mareczek vs Heihachi | 7–16 | 30.43% |
| Mareczek vs Jun | 5–11 | 31.25% |
| Mareczek vs Reina | 11–5 | 68.75% |
| Mareczek vs Jin | 4–11 | 26.67% |
| Mareczek vs Steve | 6–9 | 40.00% |
| Mareczek vs Feng | 3–10 | 23.08% |
| Mareczek vs Dragunov | 3–10 | 23.08% |
| Mareczek vs Bryan | 3–9 | 25.00% |
| Mareczek vs Lili | 2–9 | 18.18% |
| Mareczek vs Lars | 2–7 | 22.22% |
| Mareczek vs Law | 4–4 | 50.00% |
| Mareczek vs Yoshimitsu | 1–7 | 12.50% |
| Mareczek vs Devil Jin | 2–5 | 28.57% |
| Mareczek vs Azucena | 3–4 | 42.86% |
| Mareczek vs Eddy | 1–6 | 14.29% |
| Mareczek vs Hwoarang | 5–1 | 83.33% |
| Mareczek vs Xiaoyu | 6–0 | 100.00% |
| Mareczek vs Asuka | 3–3 | 50.00% |
| Mareczek vs Raven | 3–3 | 50.00% |
| Mareczek vs Paul | 2–2 | 50.00% |
| Mareczek vs Alisa | 1–3 | 25.00% |
| Mareczek vs Lidia | 2–2 | 50.00% |
| Mareczek vs Zafina | 2–1 | 66.67% |
| Mareczek vs Victor | 0–3 | 0.00% |
| Mareczek vs Kuma | 0–2 | 0.00% |
| Mareczek vs Panda | 0–2 | 0.00% |
| Mareczek vs Nina | 0–1 | 0.00% |
Limitations
This data is often requested to give insight into which characters you have more trouble with than others, but it is not particularly helpful for that. The main issue is that it is heavily skewed by how strong the opponents you play are.
For example, this data suggests my worst matchup is clearly vs Reina, but that's just because most of those games are vs Yagami.
There is a way to account for this being worked on. The central idea is to assign each matchup a rating vs you which adjusts based on the result, much like the regular rating but also based on the rating of each player. With this, it would give a better summary of how well you perform vs each character.
In the meantime, this page is here to present the data as requested.